The corresponding amount of intel pieces are located in the following levels:

LEVEL - INTEL PIECES
Level 2 - 2 intel pieces
Level 4 - 2 intel pieces
Level 5 - 3 intel pieces
Level 6 - 2 intel pieces
Level 7 - 2 intel pieces
Level 9 - 3 intel pieces
Level 10 - 2 intel pieces
Level 12 - 2 intel pieces
Level 13 - 3 intel pieces
Level 14 - 2 intel pieces
Level 16 - 2 intel pieces
Level 17 - 1 intel pieces
Level 18 - 2 intel pieces
Level 19 - 2 intel pieces